Etymology
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umbra (n.)

1590s, "phantom, ghost," a figurative use from Latin umbra "shade, shadow" (see umbrage). Astronomical sense of "shadow cast by the earth or moon during an eclipse" is first recorded 1670s. Meaning "an uninvited guest accompanying an invited one" is from 1690s in English, from a secondary sense among the Romans. Related: Umbral.

updated on February 25, 2014

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Definitions of umbra from WordNet

umbra (n.)
a region of complete shadow resulting from total obstruction of light;
From wordnet.princeton.edu, not affiliated with etymonline.